This SOP establishes the requirements for performing Bacterial Endotoxin Testing (BET) utilizing the Kinetic Chromogenic LAL method—including the setup and operation of the Pyros Kinetix Flex system, preparation of Control Standard Endotoxin (CSE) and LAL reagents, construction of standard curves via serial dilution, preparation of Positive Product Controls (PPC), and analysis of data against strict system suitability criteria—to ensure Compounded Sterile Preparations (CSPs) remain within established endotoxin limits in compliance with USP <85> and USP <797> standards.